Remove customadmin

[rochacbruno]

Issue: AAH-1478

Description 🛠

Add PR description here

Reviewer Checklists 👀

Developer reviewer:

• Code looks sound, good architectural decisions, no code smells
• There is a Jira issue associated (note that "No-Issue" should be rarely used)
• Tests are included in galaxy_ng/tests/integration or galaxy_ng/tests/functional, and they fully cover necessary test scenarios… or tests not needed

QE reviewer (exceptions):

• Tests are included in galaxy_ng/tests/integration or galaxy_ng/tests/functional, and they fully cover necessary test scenarios… or tests not needed
• PR meets applicable Acceptance Criteria for associated Jira issue

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[fao89]

LGTM, but I feel it needs a changelog entry

[fao89]

Related to pulp/pulpcore#2378

[bmbouter]

👍 to this, this was never a safe tool for Pulp, and if you need to do things the CLI can do it much better.